GemRB is a portable open-source implementation of the Infinity Engine
Arianne is an engine to develop multiplayer online games like Stendhal
Defeat all the beasties to claim victory!
Provides a full suite of clients and servers for virtual worlds.
plugin-based RPG manager in C++ and Qt5
Experiments in turn based strategy gaming.
Old School gaming tool for GMs of AD&D/OSRIC.
Cross-platform port of Arx Fatalis, a first-person role-playing game
A turn-based strategy game in the spirit of Tactics Ogre